<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        /**
         * 1. alert(输出内容)：弹框输出
         * 2. console.log(输出内容)【重点掌握】：输出到控制台
         * 3. document.write(输出内容)【了解】：输出到页面
         */

        console.log('控制台输出的内容');
        document.write('我是document.write输入的内容')

    </script>
</body>
</html>